A lot of Dutch people live in suburbs and work in cities, that explains the bulk of car traffic. If you look at trips within cities though, the bicycle has a much larger portion. In Amsterdam 38% and in Groningen 57%: https://en.wikipedia.org/wiki/Cycling_in_the_Netherlands https://en.wikipedia.org/wiki/Groningen

Comparing distance travelled is not really a useful metric in my opinion. Virtually no one is going to ride their bicycle 20-30 miles to work each day, when many people will happily travel this distance by car. It's for the short <5 mile trips that you want to incentivize people to take a bike instead of a car. That's where you have the most to gain in terms of making your city a more pleasant space to be.